Graphical user interface for a portion of a display screen



FIG. 1 is a front view of a first embodiment of a graphical user interface for a portion of a display screen showing my new design; and,

FIG. 2 is a front view of a second embodiment of a graphical user interface for a portion of a display screen showing my design.

The broken lines represent the display screen, text, and portions of the graphical user interface, and form no part of the claimed design. The greyscale shaded portion of the claimed horizontal bar represents a contrasting appearance from the unshaded portion of the claimed horizontal bar. 

CLAIM The ornamental design for a graphical user interface for a portion of a display screen, as shown and described. 